I have heard that these are really good.
Well it's certainly quicker, cleaner and makes nicer coffee to my taste than the percolator or cafetiere that I have. I put up a little review on my blog (here: AeroPress) if you're interested!
I've recently been been using Cafe Direct Machu Picchu in it after it was recommended on a cigar forum I frequent. I've gone from a cup of coffee every few months to at least one a day now!